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Using DoH is fine (good), hardcoding a specific server less so.
Well, you know they're gonna use it to circumvent ad blocking. If they want to play nice they can simply keep doing what they're doing now and use whatever DNS server they're told by DHCP.
Not using DoH is simply a leak of data, every client should use it. If they use it maliciously is a different topic but yeah I wouldn’t say its unlikely.
Do you mean leaking on the LAN or on the Internet? Because the former is a whole different kettle of fish.
Normally, LAN clienta should work with the router and let it organize these things. It's best for example to just let the router advertise itself as DNS and proxy the requests via DoH/DoT, you get a central place where you set the resolver, you can filter ads, you can do caching etc. The router can also intercept (clear) DNS traffic and secure/cache it as needed.
By default devices should expect their requests to go over the internet where DoH is very important. Over LAN much less so ofc.